Production of diazotype light-sensitive layers



Patented 'Apri 30; 7 I

UNITED STATES] PATENT OFFICE amaszr h Werner Paul Leuch, London, England, ma

to Eugene Dibtlten' 09-. Chicago, 111., a corr.

' poration Delaware No m m. Application mmao, 1930, se-

g ug 301,953. In Great Britain September 2 cum. (on. es-v') 45 dried:

wherein x represents an aliphatic radicle and Y represents an aliphatic acyl group so that theblack lines from both pencil and ink dr'awin'gsl The finished prints possess a. white background" 30 which is for all practical p poses permanently 7 xi p h f stable and m dise g alight be obtained by'the usual methods, i. e. by proand air.

Preferably Y represents the acetyl group C0033, in which case X represents an isopropyl 35 group or a group containing 4 or more C-atoms.

It is found in the case where Y is acetylthat if X represents n-propyl', ethyl or methyl, the compounds are not suitable as their coupling energy is too low and the dye produced with phloro- 0 glucinol as coupling componentbleeds when de'--- veloped in acidmedium.

Exam Paper is coated with" the following solution and copies with a good white background and greenish-black, sharp lines are obtained. Paper made with the above sensitizing solution will keep in storage for many months and possesses a high degree of light-sensitiveness.

Similar results are obtained if the corresponding isopropyl compound is used. Compounds with able reducing agent a and H01, isolating the base, diazotising and preand sodium chloride.

slightly higher coupling energy and giving greenducing the desired hydroquinone-ether, nitrating the latter, then reducing withiron and an' acid,

[for instance HCl, isolating the base and acetylating-with acetic anhydride, nitrating again in acetic acid solution and reducing with a suitsuch as zinc dust or iron cipitating the diazo compound with zinc chloride couple the latter with a suitable diazo-compound'such as diazotised sulphanilic acid, and

then split the dyestufiobtain'ed and isolate the Another procedure is to nitrate and then reduce thehydroqulnone-ether,

The present invention relates tothe manufac- 1000 ture of diazotype printing materials and has for its Zincchloride double salt ofthe diazo comobject the production 01' light-sensitive layers p nd O tain d y diazotising -minwhich are particularly suitable for development l-acetyl-amino hydroquinone-di butyl- 5 with acid developers or the type described in ether grams 35 British Patent No. 425,235. Tartaric acid do 18 t1 According to the present invention light-sensi Aluminium sulphate do ve layers which are suitable for development with acid developers containing phloroglucinol 333 3 235 2 5 2: zgz fig g g g fiz and i0 alone as coupling component or in admixture 10 with other coupling components and which have v Grams very good keeping qualities can be made by the use of diazo compounds derived from amines hav-' Resommol mg the following structural formula: Tartan 2 15 1 Sodium tartrate 5 15 X0 Sodium Iormate.. 60 1 sodium benzoate -l'. 15 in 565 cc.'water base, which after purifying is then ready for diazotising.

What I claim and desire to secure by Lette Patent is:

1. An article of manufacture for use in the production of diazotype' prints comprising a base having thereon a. light-sensitive layer comprising a diazo compound of an amine having the following structural formula:

wherein Y represents an acetyl radical and X represents an aliphatic radical of the group consisting oi the isopropyl radical and lower allphatic radicals containing more than three carbon atoms. i,

2. An article of manufacture for use in the production of diazotype prints comprising a base having thereon a light-sensitive, layer comprising a diazo compound of an amine having the following structural formula:

wherein Y represents an aliphatic acyl group and X represents an aliphatic radical of the group consisting of the isopropylradical andflower ali 

